Bithynia. Kalchedon. c.367/6-340 BC. Drachm (19 mm-3.65 g), Rhodian standard. KAΛX Bull standing left on grain ear; to left, kerykeion and ΔA monogram. Rev. Quadripartite incuse square. HGC 7, 511. SNG Black Sea 104. SNG Aulock 487-488.